Fire resistant control cable

Abstract

The utility model belongs to cable technical field, concretely is a kind of fire-resistant control cable, including multiple insulated wire core, insulated wire core from inside to outside include conductor, composite fireproof layer and insulating layer in proper order, the composite fireproof layer is by the mica tape layer of wrapping in the outside of conductor and the ceramic silicon rubber composite layer of extruding in the outside of mica tape layer constitute;Cable further includes support strip;It can be understood that, the utility model cable adopts "mica tape layer+ceramic silicon rubber composite layer" to constitute composite fireproof layer, can sinter into integral ceramic shell under high temperature, effectively fireproof and heat-insulating;Filler adopts ceramic silicon rubber fire-resistant mortar, cooperates ceramic in fire with fireproof layer, forms complete fireproof matrix;Outer layer galvanized steel wire braided armor provides compression resistance, tensile resistance and protection against animal gnawing;Double-layer halogen-free low-smoke flame-retardant polyolefin sheath ensures low toxicity and low smoke when burning;Reinforcing rib is arranged in the middle of cable, further enhances tensile and torsion resistance, and is suitable for complex harsh environment.

Description

Technical Field

[0001] This utility model belongs to the field of cable technology, and in particular relates to a fire-resistant control cable. Background Technology

[0002] Control cables are the nerve center of automated systems, widely used in control and monitoring systems in critical locations such as nuclear power plants, subways, tunnels, oil platforms, and high-rise buildings. In these applications, cables must not only ensure stable signal transmission but also maintain line integrity (meeting fire resistance standards) for a certain period during a fire, providing crucial power and signal support for fire-fighting equipment, emergency evacuation systems, and alarm systems, thus buying valuable time for personnel evacuation and rescue.

[0003] In existing technologies, mica tape (such as phlogopite tape) is commonly used to wrap the conductor as a fire-resistant layer. Although mica material itself is resistant to high temperatures, under prolonged exposure to high-temperature flames and the vibrations and impacts accompanying a fire, the mica tape is prone to becoming brittle, powdering, and detaching, leading to cracks in the fire-resistant layer and its failure, ultimately causing a short circuit. Furthermore, traditional cable structures are insufficient in terms of comprehensive performance in terms of flame retardancy, smoke suppression, water resistance, and resistance to mechanical damage, making it difficult to meet the all-round safety requirements of modern complex and high-risk environments.

[0004] To address the aforementioned problems, this application proposes a fire-resistant control cable. Utility Model Content

[0005] The purpose of this invention is to provide a fire-resistant control cable that solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to a fire-resistant control cable, comprising multiple insulated cores. From the inside out, each insulated core includes a conductor, a composite fire-resistant layer, and an insulation layer. The composite fire-resistant layer is composed of a phlogopite tape layer wrapped around the conductor and a ceramicized silicone rubber composite layer extruded around the phlogopite tape layer. The cable also includes a support strip with reinforcing ribs. Multiple insulated cores are arranged around the circumference of the support strip, and the gaps are filled with a filling layer composed of ceramicized silicone rubber fire-resistant putty.

[0008] Furthermore, the surface of the support strip is formed with an arc-shaped support groove that fits and contacts the wire core.

[0009] Furthermore, the support bar has a fitting groove at its center along its length, and an embedding groove is formed on the support bar along the fitting groove. The reinforcing rib is connected to the fitting groove through the embedding groove.

[0010] Furthermore, the conductor is made of multiple strands of soft-structure tin-plated copper wires twisted together.

[0011] Furthermore, the insulating layer is a cross-linked polyethylene material layer.

[0012] Furthermore, the filler layer is wrapped with a flame-retardant wrapping layer, which is a fiberglass tape or a halogen-free flame-retardant tape.

[0013] Furthermore, the flame-retardant wrapping layer is extruded with an inner sheath layer, the inner sheath layer is woven with an armor layer, and the armor layer is extruded with an outer sheath layer.

[0014] This utility model has the following beneficial effects:

[0015] This utility model adopts a composite fire-resistant layer structure of "phlogopite mica tape layer + ceramicized silicone rubber composite layer"; the phlogopite mica tape provides the first high-temperature insulation barrier; the outer ceramicized silicone rubber is flexible at room temperature and fits tightly with the wire core; when exposed to open flame and high temperature, it can quickly sinter into a hard ceramic shell, firmly wrapping the inner mica tape, forming a fireproof barrier with strong integrity and resistance to mechanical vibration.

[0016] This invention uses ceramicized silicone rubber refractory mortar as a filler; in a fire, it not only acts as a filler, but also ceramicizes synchronously with the composite refractory layer of the wire core, so that the entire cable core forms an integral ceramicized refractory matrix, blocking the spread of flames and hot air along the gaps.

[0017] The outermost galvanized steel wire braided armor layer of this utility model provides reliable resistance to compression, tension, impact, and rodent bites, making it particularly suitable for complex and harsh laying environments; the double-layered halogen-free, low-smoke, flame-retardant polyolefin inner and outer sheaths ensure that the cable does not release toxic halogen gases or dense smoke when burning, maximizing personnel safety.

[0018] The reinforcing ribs in the middle of the cable of this utility model enhance the cable's toughness and improve its tensile and torsional resistance.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the overall appearance structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the cable cross-section;

[0023] Figure 3 This is a structural diagram of the support strips and reinforcing ribs;

[0024] Figure 4 This is a schematic diagram of the composite refractory layer structure;

[0025] The attached diagram lists the components represented by each number as follows:

[0026] In the diagram: 1. Conductor; 2. Composite fire-resistant layer; 21. Phlogopite tape layer; 22. Ceramicized silicone rubber composite layer; 3. Insulation layer; 4. Support strip; 41. Support groove; 42. Fitting groove; 43. Embedding groove; 5. Reinforcing rib; 6. Filler layer; 7. Flame-retardant wrapping tape layer; 8. Inner sheath layer; 9. Armor layer; 10. Outer sheath layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Please see Figures 1-4As shown, this utility model is a fire-resistant control cable, including multiple insulated cores. From the inside out, each insulated core comprises a conductor 1, a composite fire-resistant layer 2, and an insulation layer 3. The composite fire-resistant layer 2 consists of a phlogopite tape layer 21 wrapped around the conductor 1 and a ceramicized silicone rubber composite layer 22 extruded around the phlogopite tape layer 21. The cable also includes a support strip 4, which has reinforcing ribs 5. Multiple insulated cores are arranged around the circumference of the support strip 4, and the gaps are filled with a filling layer 6 composed of ceramicized silicone rubber fire-resistant putty. In this embodiment, the composite fire-resistant layer is... The synergistic effect of the phlogopite tape layer and the ceramicized silicone rubber composite layer forms a double fire-resistant barrier in high-temperature environments. The phlogopite tape layer directly covers the conductor to provide basic high-temperature insulation, while the outer ceramicized silicone rubber sintersects into a ceramic-like hard shell after being exposed to fire, firmly wrapping the inner mica tape and significantly improving the overall fire resistance integrity and resistance to mechanical vibration. The filling layer uses ceramicized silicone rubber fire-resistant putty, which ceramicizes synchronously with the composite fire-resistant layer during a fire, allowing multiple insulated cores and support strips to combine into an overall fire-resistant matrix, effectively preventing flames and high-temperature gases from spreading along the internal gaps of the cable.

[0030] Furthermore, the support bar 4 has an arc-shaped support groove 41 formed on its surface that fits into contact with the wire core, increasing the contact area and providing uniform radial support force. This prevents the wire core from shifting relative to the support bar during bending and laying, while also optimizing the internal structural stability of the cable and further improving the overall integrity of the fire-resistant layer at high temperatures.

[0031] Furthermore, a fitting groove 42 is provided at the center of the support bar 4 along the length direction, and an embedding groove 43 is provided on the support bar 4 along the fitting groove 42. The reinforcing rib 5 is connected to the fitting groove 42 through the embedding groove 43. The fitting groove and the embedding groove together form the installation channel of the reinforcing rib. The reinforcing rib is fixed by mechanical fitting, so that it forms a continuous support in the length direction of the cable, which significantly improves the tensile strength and torsional performance of the cable, while avoiding local stress concentration of the reinforcing rib when the cable is bent.

[0032] Furthermore, conductor 1 is made of multiple soft-structure tin-plated copper wires stranded together. In this embodiment, the soft-structure tin-plated copper wire stranded conductor maintains high conductivity while improving the conductor's oxidation and corrosion resistance through tin plating. The stranded structure enhances the cable's flexibility and repeated bending performance, making it suitable for installation scenarios that require frequent movement.

[0033] Furthermore, insulation layer 3 is a cross-linked polyethylene material layer. Cross-linked polyethylene insulation layer has excellent electrical insulation performance and heat aging resistance. It can still maintain structural stability in high temperature environment. Its low dielectric constant and low loss factor help to ensure signal transmission quality and are suitable for the high reliability requirements of control cables.

[0034] Specifically, the filler layer 6 is wrapped with a flame-retardant wrapping layer 7, which is a fiberglass tape or a halogen-free flame-retardant tape. The flame-retardant wrapping layer covers the outside of the filler layer, further preventing the flame from spreading radially along the cable. The fiberglass tape or halogen-free flame-retardant tape forms a heat-insulating carbon layer at high temperatures, which not only maintains the integrity of the wrapping structure but also avoids the production of toxic halogen gases during combustion, thereby enhancing the overall flame retardancy and environmental safety of the cable.

[0035] Specifically, the flame-retardant wrapping layer 7 is externally extruded with an inner sheath layer 8, the inner sheath layer 8 is externally braided with an armor layer 9, and the armor layer 9 is externally extruded with an outer sheath layer 10. The inner sheath layer is made of halogen-free low-smoke polyolefin material, providing initial mechanical protection and a flame-retardant barrier; the armor layer provides physical protection against compression, tension, and rodent bites through a metal braided structure; the outer sheath layer, as the final protective layer, has both environmental corrosion resistance and flame-retardant properties. The three-layer structure together ensures the long-term safe operation of the cable under complex working conditions.

[0036] It is understood that the cable of this utility model adopts a composite fire-resistant layer consisting of a "phlogopite tape layer + ceramicized silicone rubber composite layer", which can be sintered into an integral ceramic shell at high temperatures, effectively blocking fire and insulating heat; the filler is ceramicized silicone rubber fire-resistant mortar, which co-ceramizes with the fire-resistant layer in a fire to form a complete fire-resistant matrix; the outer galvanized steel wire braided armor provides protection against compression, tension and animal bites; the double-layer halogen-free low-smoke flame-retardant polyolefin sheath ensures low toxicity and low smoke during combustion; the cable is reinforced with ribs in the middle to further enhance its tensile and torsional performance, making it suitable for complex and harsh environments.

[0037] One specific application of this embodiment is as follows: First, a single insulated wire core is manufactured: a conductor 1 is made by stranding tinned copper wire bundles; a layer of phlogopite tape 21 is tightly wrapped around the conductor 1 to form the first fire-resistant barrier; then, a ceramicized silicone rubber composite layer 22 with a thickness of about 0.5 mm is directly extruded over the phlogopite tape layer 21, and the two are tightly combined to form a strong and flexible composite fire-resistant layer 2; finally, a layer of cross-linked polyethylene material is extruded over the composite fire-resistant layer 2 as an insulation layer 3;

[0038] The support bar 4 is extruded and formed together with the support groove 41, the fitting groove 42, and the embedding groove 43. The reinforcing rib 5 is pressed into the fitting groove 42 through the embedding groove 43. The above-formed multiple insulated wire cores are attached to the support groove 41 and arranged. Then, the gaps between the insulated wire cores are filled with ceramicized silicone rubber refractory mud as a filling layer 6 to ensure the cable core is round.

[0039] After cabling, a layer of halogen-free flame-retardant tape is tightly wrapped around the outside of the cable core as a flame-retardant wrapping layer 7. Then, a layer of halogen-free low-smoke flame-retardant polyolefin material is extruded to form an inner sheath layer 8; outside the inner sheath layer 8, a layer of galvanized steel wire armor layer 9 is woven to provide ultimate mechanical protection; the outermost layer is a layer of halogen-free low-smoke flame-retardant polyolefin material extruded as an outer sheath layer 10, completing the manufacturing of the entire cable.

[0040] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A fire-resistant control cable, comprising multiple insulated cores, characterized in that: The insulated core consists of a conductor (1), a composite fire-resistant layer (2), and an insulation layer (3) from the inside out. The composite fire-resistant layer (2) is composed of a phlogopite tape layer (21) wrapped around the conductor (1) and a ceramicized silicone rubber composite layer (22) extruded around the phlogopite tape layer (21). The cable also includes a support strip (4), which has reinforcing ribs (5). Multiple insulated cores are arranged around the circumference of the support strip (4) and the gaps are filled with a filling layer (6) composed of ceramicized silicone rubber refractory mortar.

2. The fire-resistant control cable according to claim 1, characterized in that: The support bar (4) has an arc-shaped support groove (41) formed on its surface, which is in contact with the wire core.

3. The fire-resistant control cable according to claim 1, characterized in that: The support bar (4) has a fitting groove (42) at its center along its length, and an embedding groove (43) is formed on the upper part of the support bar (4) along the fitting groove (42). The reinforcing rib (5) is connected to the fitting groove (42) through the embedding groove (43).

4. A fire-resistant control cable according to claim 1, characterized in that: The conductor (1) is made of multiple soft-structure tin-plated copper wires twisted together.

5. A fire-resistant control cable according to claim 1, characterized in that: The insulating layer (3) is a cross-linked polyethylene material layer.

6. A fire-resistant control cable according to claim 1, characterized in that: The filler layer (6) is wrapped with a flame-retardant wrapping layer (7), which is a fiberglass tape or a halogen-free flame-retardant tape.

7. A fire-resistant control cable according to claim 6, characterized in that: The flame-retardant wrapping layer (7) is extruded with an inner sheath layer (8), the inner sheath layer (8) is woven with an armor layer (9), and the armor layer (9) is extruded with an outer sheath layer (10).

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